Eizo CG221 - Manual (Page 53)

Gain Adjustment
Adjusts each color parameter for red, green and blue. The color of the LCD monitor is
displayed through the color filter of the LCD panel. Red, green and blue are the three
primary colors. The colors on the monitor are displayed by combining these three
colors. The color tone can change by adjusting the illumination amount passed through
each color's filter.
Gamma
Generally, the relationship that the light intensity values of a monitor change
nonlinearly to the input signal level is called "Gamma Characteristic". On the monitor,
low gamma values display the whitish images and high gamma values display the high
contrast images.
Phase
The phase adjustment decides the sampling timing point for converting the analog
input signal to a digital signal. Adjusting the phase after the clock adjustment will
produce a clear screen.
Range Adjustment
The Range Adjustment controls the level of output signal range to display the whole
color gradation.